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MFSA2021-11 Firefox: Security Vulnerabilities fixed in Firefox ESR 78.9 (CVE-2021-23984)

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MFSA2021-11 Firefox: Security Vulnerabilities fixed in Firefox ESR 78.9 (CVE-2021-23984)

Severity
4
CVSS
(AV:N/AC:M/Au:N/C:N/I:P/A:N)
Published
03/23/2021
Created
03/24/2021
Added
03/24/2021
Modified
06/28/2021

Description

A malicious extension could have opened a popup window lacking an address bar. The title of the popup lacking an address bar should not be fully controllable, but in this situation was. This could have been used to spoof a website and attempt to trick the user into providing credentials. This vulnerability affects Firefox ESR < 78.9, Firefox < 87, and Thunderbird < 78.9.

Solution(s)

  • mozilla-firefox-esr-upgrade-78_9

References

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